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bio-integrity: add "bip_max_vcnt" into struct bio_integrity_payload 

Commit 08778795 ("block: Fix nr_vecs for inline integrity vectors") from
Martin introduces the function bip_integrity_vecs(get the useful vectors)
to fix the issue about nr_vecs for inline integrity vectors that reported
by David Milburn.

But it seems that bip_integrity_vecs() will return the wrong number if the
bio is not based on any bio_set for some reason(bio->bi_pool == NULL),
because in that case, the bip_inline_vecs[0] is malloced directly.  So
here we add the bip_max_vcnt to record the count of vector slots, and
cleanup the function bip_integrity_vecs().

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Gu Zheng 2014-07-01 10:36:47 -06:00 committed by Jens Axboe
parent add703fda9
commit cbcd1054a1
2 changed files with 4 additions and 9 deletions
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12
block/bio-integrity.c
View File

@ -70,8 +70,10 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
bs->bvec_integrity_pool);
if (!bip->bip_vec)
goto err;
bip->bip_max_vcnt = bvec_nr_vecs(idx);
} else {
bip->bip_vec = bip->bip_inline_vecs;
bip->bip_max_vcnt = inline_vecs;
}
bip->bip_slab = idx;
@ -114,14 +116,6 @@ void bio_integrity_free(struct bio *bio)
}
EXPORT_SYMBOL(bio_integrity_free);
static inline unsigned int bip_integrity_vecs(struct bio_integrity_payload *bip)
{
if (bip->bip_slab == BIO_POOL_NONE)
return BIP_INLINE_VECS;
return bvec_nr_vecs(bip->bip_slab);
}
/**
* bio_integrity_add_page - Attach integrity metadata
* @bio: bio to update
@ -137,7 +131,7 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
struct bio_integrity_payload *bip = bio->bi_integrity;
struct bio_vec *iv;
if (bip->bip_vcnt >= bip_integrity_vecs(bip)) {
if (bip->bip_vcnt >= bip->bip_max_vcnt) {
printk(KERN_ERR "%s: bip_vec full\n", __func__);
return 0;
}

1
include/linux/bio.h
View File

@ -308,6 +308,7 @@ struct bio_integrity_payload {
unsigned short bip_slab; /* slab the bip came from */
unsigned short bip_vcnt; /* # of integrity bio_vecs */
unsigned short bip_max_vcnt; /* integrity bio_vec slots */
unsigned bip_owns_buf:1; /* should free bip_buf */
struct work_struct bip_work; /* I/O completion */